Refrigerant distribution device for refrigeration system

ABSTRACT

The invention provides a refrigerant distribution device for refrigeration system which is capable of improving heat exchange efficiency, comprising: an entering duct, a bottom cover plate, a core, a hollow cylinder, an upper cover plate and multi-branch ducts. The core is disposed in the space formed by the bottom cover plate, the cylinder and the upper cover plate, wherein a plurality of openings are distributed on the core. The refrigerant distribution device according to the invention is capable of realizing uniform distribution and allocation of refrigerant in refrigeration system, and improving heat exchange efficiency of the refrigeration system.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims priority to Chinese Patent ApplicationNo. 200910143947.7 filed Jun. 2, 2009.

FIELD OF THE INVENTION

The invention relates to a fluid distribution device, particularlyrelates to a refrigerant distribution device utilized in refrigerationsystem.

BACKGROUND OF THE INVENTION

To improve the heat exchange efficiency of refrigeration system,refrigerant distribution device is broadly used in prior refrigerationsystems. As shown in FIG. 1, it is a conventional heat pumpair-conditioning system. The system mainly comprises followingcomponents: a compressor 7, a duct 6, a four-way reversing valve 13, amultipieces (more than two pieces) heat exchanger 5, a fan 4, a smalldistributor 2, a capillary 3, a principal distributor 1, a thermalexpansion valve 11, a temperature sensing bulb 12, a drier filter 10, aheat exchanger 9 and a gas-liquid separator 8.

When the units operate at the heat pump condition, the high temperatureand high pressure refrigerant gas exhausted by the compressor 7 entersinto the heat exchanger 9 via the duct 6 and the four-way reversingvalve 13; after making a heat exchange with cooling water in the heatexchanger 9, the refrigerant turns into high temperature and highpressure refrigerant liquid, get throttled in the thermal expansionvalve 11 via the duct 6 and the drier filter 10, then becomes lowtemperature and low pressure gas-liquid two phases state and enters theprincipal distributor 1, distributed to the small distributor 2 of eachheat exchanger by the principal distributor 1, and enters into each heatexchanger 5 via the capillary 3 of small distributor 2; by the rotationof fan 4, the refrigerant in heat exchanger 5 makes a forced heatexchange with the air, after passing through the duct 6, the four-wayreversing valve 13 and the gas-liquid separator 8, enters into the airsuction inlet of compressor 7, compressed in the compressor and turnsinto high temperature and high pressure gas. Accordingly, it forms acomplete refrigeration cycle. The temperature sensing bulb 12 of thermalexpansion valve 11 is applied for adjusting the valve opening degree bytesting overheat degree of low temperature and low pressure gas.

Generally, the refrigerant state entering into the principal distributor1 is two phases of gas and liquid. Because gas refrigerant and liquidrefrigerant have different densities and distributions, it is difficultto make a uniform mixture in the principal distributor 1. Whether therefrigerant is uniformly distributed in the principal distributor 1 andthen enters into each heat exchanger 5 is critical to determine andrestrict the performance of heat exchanger 5 and the units.

In view of the above-mentioned problems, in order to improve the heatexchange efficiency of refrigeration system, it needs a refrigerantdistribution device applying in refrigeration system for realizinguniform distribution and allocation of refrigerant.

SUMMARY OF THE INVENTION

A series of concepts with simplified form are referenced in theinvention content, which will be further described in detail in the partof particular embodiments. The invention content of the presentinvention does not imply to attempt to limit the critical features andthe essential technical features of the solution which it seeks toprotect, furthermore, does not imply to attempt to ensure the protectionscope of technical solution which it seeks to protect.

In order to solve the problems in the prior technology asabove-mentioned, the invention provides a refrigerant distributiondevice for refrigeration system, capable of improving heat exchangeefficiency, comprising: an entering duct, a bottom cover plate, a core,a hollow cylinder, an upper cover plate and multi-branch ducts, saidcore disposed in the space formed by the bottom cover plate, thecylinder and the upper cover plate, a plurality of openings distributedon the core.

According to another aspect of the invention, said upper cover plate hasa centrosymmetric shape; an upper cover plate protuberance protuberatingto said multi-branch ducts is disposed at its center.

According to another aspect of the invention, said upper cover plate hasa circular or semi-ellipsoidal shape.

According to another aspect of the invention, said upper cover plate andsaid cylinder are integrated.

According to another aspect of the invention, the side that saidentering duct connects said bottom cover plate has an invaginated port,whose cross section contour is any of hyperbola, parabola or straightline.

According to another aspect of the invention, the inner wall of saidentering duct is provided with threads.

According to another aspect of the invention, said core is a circularflat plate with centrosymmetric shape, a spherical crown protuberatingto the cylinder provided at its center, said openings uniformlydistributed around the spherical crown, equal scale gaps uniformlydistributed at circumferential equal-angle of said core.

According to another aspect of the invention, said openings being one ormore of these kinds: circular openings, petal-shaped openings and/orsquare openings.

According to another aspect of the invention, said core is a hollowcone-shaped cylinder, said cylinder connected to said bottom cover plateby the supporting feet disposed at the bottom of the cone, a narrowspace formed between said supporting feet.

According to another aspect of the invention, along the refrigerant'sflowing direction, said core successively comprises a cylindrical firstcylinder with a larger section diameter, a connector and a cylindricalsecond cylinder with a smaller section diameter, said openings uniformlydistributed on said first cylinder, said connector and said secondcylinder.

According to another aspect of the invention, said connector is annularflat plate or cone-shaped cylinder.

According to another aspect of the invention, said core comprises acylindrical cylinder, an ellipsoidal shell and an annular flat plate,said openings uniformly distributed on said cylindrical cylinder, saidshell embedded within said cylindrical cylinder, said annular flat plateprovided in the middle of said cylindrical cylinder and surrounding saidcylindrical cylinder, a plurality of gaps uniformly provided at theperipheral edge of said annular flat plate, supporting feet used toconnect to said bottom cover plate provided at said shell.

According to another aspect of the invention, said core is a sphericalsurface shell, said openings uniformly distributed on said shell,supporting feet used to connect to said bottom cover plate provided atthe bottom of said shell.

According to another aspect of the invention, a plurality of guidingblades are uniformly distributed at the inner side of said shell.

BRIEF DESCRIPTION OF THE DRAWINGS

The following figures of the present invention are used to illustratethe invention herein as one part of the present invention. Theembodiments and description thereof of the present invention are shownin the figures in order to explain the principle of the invention,wherein:

FIG. 1 is a schematic diagram of conventional refrigeration system inthe prior technology;

FIG. 2 is a structural schematic diagram of the first embodiment inaccordance with the refrigerant distribution device of the invention;

FIG. 3 is a structural schematic diagram of the first embodiment of theupper cover plate of the refrigerant distribution device in FIG. 2;

FIG. 4 a is a structural schematic diagram of the second embodiment ofthe upper cover plate of the refrigerant distribution device in FIG. 2;

FIG. 4 b is a sectional view along the central line of FIG. 4 a;

FIG. 5 is a structural schematic diagram of the first embodiment of theentering duct of the refrigerant distribution device in FIG. 2;

FIG. 6 is a structural schematic diagram of the second embodiment of theentering duct of the refrigerant distribution device in FIG. 2;

FIG. 7 is a structural schematic diagram of the third embodiment of theentering duct of the refrigerant distribution device in FIG. 2;

FIG. 8 is a structural schematic diagram of the fourth embodiment of theentering duct of the refrigerant distribution device in FIG. 2;

FIG. 9 is a structural schematic diagram of the first embodiment of thecore of the refrigerant distribution device in FIG. 2;

FIG. 10 is a structural schematic diagram of the second embodiment ofthe core of the refrigerant distribution device in FIG. 2;

FIG. 11 is a structural schematic diagram of the third embodiment of thecore of the refrigerant distribution device in FIG. 2;

FIG. 12 is a structural schematic diagram of the second embodiment ofthe refrigerant distribution device in accordance with the presentinvention;

FIG. 13 is a structural schematic diagram of the first embodiment of thecore of the refrigerant distribution device in FIG. 12;

FIG. 14 is a structural schematic diagram of the second embodiment ofthe core of the refrigerant distribution device in FIG. 12;

FIG. 15 is a structural schematic diagram of the third embodiment of thecore of the refrigerant distribution device in FIG. 12;

FIG. 16 is a structural schematic diagram of the third embodiment of therefrigerant distribution device in accordance with the presentinvention;

FIG. 17 is a structural schematic diagram of the core of the refrigerantdistribution device in FIG. 16;

FIG. 18 is a structural schematic diagram of the fourth embodiment ofthe refrigerant distribution device in accordance with the presentinvention;

FIG. 19 is a structural schematic diagram of the first embodiment of thecore of the refrigerant distribution device in FIG. 18;

FIG. 20 is a structural schematic diagram of the second embodiment ofthe core of the refrigerant distribution device in FIG. 18.

DETAILED DESCRIPTION OF THE INVENTION

In the following description, a number of particular details aredisclosed for a clearer understanding of the present invention. However,it is obvious for those skilled in the art that the invention can beimplemented without one or more such details. In other examples, somecommon technical features in the art are not described in order to avoidconfusion with the present invention.

A detailed explanation of the present invention will be presented withreference to the accompanying figures.

FIG. 2 is a structural schematic diagram of the first embodiment of therefrigerant distribution device in principal distributor forrefrigeration system in accordance with the present invention. As shownin FIG. 2, the refrigerant distribution device 1, along therefrigerant's flowing direction, successively comprises: a refrigerantentering duct 1_1, a bottom cover plate 1_2, a core 1_3, a cylinder 1_4,an upper cover plate 1_5 and multi-branch ducts 1_6. The refrigerant asshown in FIG. 1 is throttled by the thermal expansion valve 11, formstwo phases state of gas and liquid, and enters into the distributiondevice 1 via the entering duct 1_1 of the refrigerant distributiondevice 1. After impacting with the core 1_3 of the refrigerantdistribution device 1 and being throttled, the refrigerant of two phasesof gas-liquid is mixed fully and uniformly in the distribution device 1,then flows out from the distribution device 1 by the upper cover plate1_5 and the multi-branch ducts 1_6, and into the heat exchanger 5 asshown in FIG. 1. In this embodiment, the entering duct 1_1 is of hollowcylinder structure; the bottom cover plate 1_2 has an opening withconsistent duct diameter with said entering duct 1_1 and connects to theentering duct 1_1; the core 1_3 is disposed into the cylinder 1_4, onwhich distributed the first openings with different kinds and apertures.

FIG. 3 is a structural schematic diagram of the first embodiment of theupper cover plate of the refrigerant distribution device in FIG. 2. Asshown in the figure, the upper cover plate 1_51 has a centrosymmetricshape, such as circular shape, on which disposed at least two secondopenings 1_511 corresponding to the multi-branch ducts 1_6, wherein thediameters of the openings are determined in accordance with the diameterof their connecting ducts 1_6.

A plurality of second openings 1_511 on said upper cover plate 1_51 aredisposed in accordance with the number of duct orifices of saidmulti-branch ducts 1_6, and connect with the multi-branch ducts 1_6.

FIG. 4 a and FIG. 4 b are structural schematic diagrams of the secondembodiment of the upper cover plate of the refrigerant distributiondevice shown in FIG. 2, wherein FIG. 4 b is a sectional view along thecentral line of FIG. 4 a. As shown in FIGS. 4 a and 4 b, the upper coverplate 1_52 having a centrosymmetric shape is provided with an uppercover plate protuberance 1_522 on its central area, a plurality of (morethan two) second openings 1_521 corresponding to the duct orifices ofsaid multi-branch ducts 1_6 distributed around the protuberance 1_522,the second openings 1_521 connecting with the multi-branch ducts 1_6.The upper cover plate protuberance 1_522 protuberates to themulti-branch ducts 1_6, whose size and shape are disposed in line withthe distribution state of the orifices of the multi-branch ducts 1_6.The upper cover plate protuberance 1_522 makes a certain improvement forimpacting effect and throttling effect of two phases refrigerant fluid,and enhances the uniformity of the principal distributor's distribution.

FIG. 5, FIG. 6, FIG. 7 and FIG. 8 respectively shows various kinds ofstructural schematic diagrams of the entering duct 1_1 of therefrigerant distribution device in FIG. 2. The structure of enteringduct 1_11 shown in FIG. 5 is a spiral duct, whose function is producinga certain agitation when the refrigerant enters into the distributingdevice 1, in order to make a certain pre-mixture of refrigerant gas andliquid. As shown in FIG. 6, the side of the entering duct 1_12connecting to the bottom cover plate 1_2 has an invaginated port, whosecross section contour is hyperbola form in order that the flowingsectional area can gradually reduces when refrigerant gas and liquidflows to the bottom cover plate 1_2, which enhances the speed of therefrigerant entering into the distribution device 1, brings betterimpacting effect and throttling effect of fluid, and further improvesthe uniformity of principal distributor distribution. At the sideconnecting to the bottom cover plate 1_2, the entering duct 1_13 shownin FIG. 7 has an invaginated port whose sectional contour line isparabola form, which can likewise gradually reduce the flowing sectionalarea when the refrigerant gas and liquid flows towards the bottom coverplate 1_2, and enhance the speed of the refrigerant entering into thedistribution device 1. The entering duct 1_14 shown in FIG. 8 has aninvaginated port that the sectional contour line is linear form at theside connecting to the bottom cover plate 1_2, which also graduallyreduces the flowing sectional area when the refrigerant gas and liquidflows towards the bottom cover plate 1_2. Certainly, the sectional areacontour line of invaginated port of the entering ducts in FIGS. 6-8 isnot limited in hyperbola, parabola or straight line, other line typesare also acceptable, providing that they are capable of improving thespeed that the refrigerant entering the distribution device.

FIG. 9 is a structural schematic diagram of the first embodiment of thecore of the refrigerant distribution device in FIG. 2. As shown in FIG.9, the core 1_31 is a circular flat plate, whose central part has anellipsoidal crown 1_313, the crown protuberating to the cylinder 1_4. Aplurality of circular first openings 1_312 are uniformly distributed atequal angles of circumference of the circular flat plate. The apertureof the openings is 1˜3 mm. The first gaps 1_311 with equal scales areuniformly distributed at equal angles along the circumference. When therefrigerant entering through the entering duct 1_1 of distributiondevice 1 impacts the crown 1_313, the liquid droplets included in therefrigerant break into small droplets; the gas and liquid simultaneouslychange the direction; by throttling of the uniformly distributed firstopenings 1_312 on flat plate, the gas-liquid mixture becomes therefrigerant mixture with more uniform thinning droplets; a part of therefrigerant enters into the upper space of distribution device 1 afterpassing through the first gaps 1_311. Two parts of refrigerant at theupper part of core 1_31 of distribution device 1 are uniformlydistributed in each heat exchanger 5 by multi-branch ducts 1_6. Theapplication of first gaps 1_311 is capable of effectively reducing thepressure loss that the refrigerant flows through the principaldistribution device 1.

FIG. 10 is a structural schematic diagram of the second embodiment ofthe core of the refrigerant distribution device in FIG. 2. As shown inFIG. 10, core 1_32 is a circular flat plate; an ellipsoid protuberance1_323 is provided on the central part; a plurality of circular firstopenings 1_322 are uniformly distributed along the circumference of theprotuberance 1_323 at equal angles; also uniformly disposed arepetal-shaped first openings 1_321 along the circumferential equalangles. When the refrigerant entering through the entering 1_1 duct ofdistribution device 1 impacts the spherical crown 1_323, the gas andliquid simultaneously change the direction; by throttling of theuniformly distributed first openings 1_322 on the flat plate, thegas-liquid mixture becomes the refrigerant mixture with more uniformthinning droplets; a part of gas-liquid mixture enters into the upperpart space of distribution device 1 by throttling of petal-shaped firstopenings 1_321. The refrigerant of two parts at the upper part of core1_32 of distribution device 1 is uniformly distributed in each heatexchanger 5 by the multi-branch ducts 1_6.

FIG. 11 is a structural schematic diagram of the third embodiment of thecore of the refrigerant distribution device in FIG. 2. As shown in FIG.11, the core 1_33 is a circular flat plate; a protuberated ellipsoidalcrown 1_333 is provided at the central part; a plurality of circularfirst openings 1_332 are uniformly distributed along the circumferentialequal angles of the spherical crown 1_333; also uniformly distributedare square first openings 1_331 along the equal angles of thecircumference of the circular flat plate with the radial direction. Whenthe refrigerant entering through the entering duct 1_1 of distributiondevice 1 impacts the spherical crown 1_333, the liquid droplets includedin the refrigerant break into small droplets; the gas and liquidsimultaneously change the direction; by the throttling of the uniformlydistributed circular first openings 1_332, the gas-liquid mixturebecomes the refrigerant mixture with more uniform thinning droplets; apart of gas-liquid mixture enters into the upper part space ofdistribution device 1 by the throttling of square first openings 1_331.The refrigerant of two parts at the upper part of core 1_33 ofdistribution device 1 is uniformly distributed in each heat exchanger 5by the multi-branch ducts 1_6. It can be seen from the figures that theopening size of the first openings become gradually larger along theoutward radial direction of the core 1_33, which is favorable to thedistribution effect.

FIG. 12 is a structural schematic diagram of the second embodiment ofthe refrigerant distribution device in accordance with the presentinvention. As shown in FIG. 12, in this embodiment, along therefrigerant flowing direction, the refrigerant distribution device 2successively comprises: a refrigerant entering duct 2_1, a bottom coverplate 2_2, a core 2_3, a cylinder 2_4 and multi-branch ducts 2_5. Therefrigerant gets throttled via the thermal expansion valve 11, forms twophases state of gas-liquid, enters into the distribution device 2 viathe entering duct 2_1 of refrigerant distribution device 2. Therefrigerant of two phases of gas and liquid is uniformly mixed withinthe distribution device 2 after impacting with the bottom cover plate2_2 and throttled via the core 2_3, then flows into the heat exchanger 5via the multi-branch ducts 2_5. In this embodiment, said cylinder 2_4also serves as upper cover plate. Said cylinder 2_4 is open at one side,connecting said bottom cover plate 2_2; the other side of said cylinderis a closed outward protuberated spherical surface, a plurality ofsecond openings provided on the outward protuberated spherical surface,corresponding to the orifices of the multi-branch ducts 2_5. Theparticular structure of the core 2_3 will be described in detail asfollows.

FIG. 13 is a structural schematic diagram of the first embodiment of thecore of the refrigerant distribution device in FIG. 12. As shown in FIG.13, in this embodiment, the core 2_31 is a cylinder 2_313 with hollowcone shape, wherein the refrigerant flows from the cone bottom withlarger cross section to the cone top with smaller cross section. Aplurality of first openings 2_314 are uniformly distributed at equalangles on the wall of the cylinder 2_313; the lower part of cylinder2_313 is connected with the supporting feet 2_312, which are used forconnecting the core 2_31 and the bottom cover plate 2_2 of distributiondevice 1. The conical top of the conical thin wall cylinder 2_313 is anopening. After the refrigerant entering through the entering duct 2_1 ofdistribution device 1 impacts the bottom cover plate 2_2, the liquiddroplets included in the refrigerant break into small droplets, the gasand liquid simultaneously change the direction, partial refrigerant isthrottled by the first openings 2_314 and enters into the multi-branchducts 2_5, and partial refrigerant enters into the multi-branch ducts2_5 by the narrow space A (as shown in partial view A) formed betweenthe cylinder 2_313 and the supporting feet 2_312, and is uniformlydistributed in each heat exchanger 5. On the one hand, the conical core2_31 gradually reduces the fluid flowing section area to compress therefrigerant and further mixes the two phases of gas and liquid; on theother hand, it improves the flowing speed and increases the impactingeffect, diminishes the diameter of the small liquid droplets that arethe liquid droplets included in the refrigerant formed by the impact,and enhances the effect of uniform mixture of gas and liquid. Thepressure loss and the distribution performance after the refrigerantpassing through the refrigerant distribution device 2 can be effectivelycontrolled by adjusting the height and the width of the supporting feet2_312. The supporting feet 2_312 can utilize the connecting manner (forexample, welding) known for those skilled in the art to fix the conicalthin wall cylinder 2_313 at the bottom cover plate 2_2.

FIG. 14 is a structural schematic diagram of the second embodiment ofthe core of the refrigerant distribution device in FIG. 12. As shown inFIG. 14, in this embodiment, said core 2_32, along the refrigerantflowing direction, successively comprises: a cylindrical first cylinder2_321 with a larger section diameter, an annular flat plate 2_323 and acylindrical second cylinder 2_324 with a smaller section diameter. Thefirst cylinder 2_321 is connected with the second cylinder 2_324 via theannular flat plate 2_323. A plurality of circular first openings 2_322are uniformly distributed on the first cylinder 2_321, second cylinder2_324 and the flat plate 2_323. The liquid droplets included in therefrigerant break into small droplets after the refrigerant enteringthrough the entering duct 2_1 of the refrigerant distribution device 2impacts the bottom cover plate 2_2; the gas and liquid simultaneouslychange the direction and throttled by the first openings 2_322 on thefirst cylinder 2_321, second cylinder 2_324 and flat plate 2_323, formmore uniform mixture, enter into the multi-branch ducts 2_5, and areuniformly distributed in each heat exchanger 5. The section diameter ofthe second cylinder 2_324 is smaller than that of the first cylinder2_321. On the one hand, the arrangement compresses the refrigerant dueto the reduction of flowing area and further mixes the two phases of gasand liquid; On the other hand, the arrangement improves the flowingspeed, increases the impacting effect, diminishes the diameter of thesmall liquid droplets in the refrigerant formed by the impact, andenhances the effect of uniform mixture of gas and liquid. Furthermore,it can effectively solve the problem that the cylinder diameter ofrefrigerant distribution device 2 has to be expanded due to the increaseof the number of multi-branch ducts in the prior technology.

FIG. 15 is a structural schematic diagram of the third embodiment of thecore of the refrigerant distribution device in FIG. 12. As shown in FIG.15, in this embodiment, the core 2_33, along the refrigerant flowingdirection, successively comprises: a cylindrical first cylinder 2_331with a larger section diameter, a conical cylinder 2_333 and acylindrical second cylinder 2_334 with a smaller section diameter. Thefirst cylinder 2_331 is connected with the second cylinder 2_334 via theconical cylinder 2_333. As shown in FIG. 15, the bottom of the conicalcylinder 2_333 communicates with the first cylinder 2_332; the top ofthe conical cylinder 2_333 communicates with the second cylinder 2_334.The first openings 2_332 are uniformly distributed on the first cylinder2_331, the conical cylinder 2_333 and the second cylinder 2_334. Afterthe refrigerant entering through the entering duct 2_1 of refrigerantdistribution device 2 and impacting the bottom cover plate 2_2, theliquid droplets included in the refrigerant break into small droplets;the gas and liquid simultaneously change the direction and are throttledby the first openings 2_332 on the first cylinder 2_331, conicalcylinder 2_333 and second cylinder 2_334, form more uniform mixture andenter into the multi-branch ducts 2_5, and uniformly distributed in eachheat exchanger 5. The section diameter of the second cylinder 2_334 issmaller than that of the first cylinder 2_331. On the one hand, thearrangement compresses the refrigerant due to the reduction of flowingarea and further mixes two phases of gas and liquid; On the other hand,the arrangement improves the flowing speed and increases the impactingeffect, diminishes the droplet diameter of the small liquid droplets inthe refrigerant formed by the impact, enhances the effect of uniformmixture of gas and liquid. Furthermore, it also can effectively solvethe problem that the cylinder diameter of the refrigerant distributiondevice 2 needs to be gradually expanded due to the increase of thenumber of the multi-branch ducts. The utility of the second cylindricalcylinder 2_334 can gradually reduce the fluid section, graduallyincrease the refrigerant flowing speed and improve the effect to formsmall droplets after the liquid droplets impacting the upper coverplate.

FIG. 16 is a structural schematic diagram of the third embodiment of therefrigerant distribution device in accordance with the presentinvention. As shown in FIG. 16, in this embodiment, the refrigerantdistribution device 3, along the refrigerant flowing direction,successively comprises: a refrigerant entering duct 3_1, a bottom coverplate 3_2, a core 3_3, a cylinder 3_4, an upper cover plate 3_5 andmulti-branch ducts 3_6. The refrigerant is throttled via the thermalexpansion valve 11, forms two phases state of gas and liquid, enters thedistribution device 3 via the entering duct 3_1 of the distributiondevice 3; the refrigerant of the two phases of gas and liquid isuniformly mixed in the refrigerant distribution device 3 after therefrigerant impacting with the bottom cover plate 3_2 and the core 3_3of the distribution device 3 and being throttled, and flows into theheat exchanger 5 via the multi-branch ducts 3_6. The difference betweenthis embodiment and other embodiments lies in their different structuresof core 3_3, more particularly, as shown in FIG. 17.

FIG. 17 is a structural schematic diagram of the core of the refrigerantdistribution device in FIG. 16. As shown in FIG. 17, in this embodiment,the core 3_4 comprises the cylindrical cylinder 3_41 on which the firstopenings 3_45 are uniformly distributed, the first shell 3_42 withellipsoidal thin wall and the annular flat plate 3_44 with the uniformlydistributed gaps 3_46. The first shell 3_42 is embedded in the endconnecting the bottom cover plate 3_2 in the cylinder 3_41, has thefirst supporting feet 3_43 utilized for fixing, locating and connectingthe first shell 3_42 with the bottom cover plate 3_2. The annular flatplate 3_44 is provided in the middle of the cylindrical cylinder 3_41and around the cylindrical cylinder 3_41; a plurality of gaps 3_46 areuniformly provided at the spherical edge of the annular flat plate.After the refrigerant entering through the entering duct 3_1 ofdistribution device 3 and impacting the first shell 3_42 withellipsoidal thin wall, the big droplets liquid included in therefrigerant are broken into small droplets; the gas and liquidsimultaneously change the direction; partial gas directly enters intothe top space of the cylindrical cylinder 3_41 through the narrow spaceformed by the first shell 3_42 with ellipsoidal thin wall and thecylindrical cylinder 3_41, enters into the upper cover plate 3_5 ofdistribution device 3 after being throttled by the first openings 3_45,and distributed in heat exchanger 5. Partial gas is distributed in heatexchanger 5 after being throttled by the first openings 3_45 of thebottom of the cylindrical cylinder 3_41 and entering into themulti-branch ducts 3_6 via the gaps 3_46 of the annular flat plate 3_44.The utility of the first supporting feet 3_43 of the first shell 3_42with ellipsoidal thin wall, on the one hand, functions as the fixation,location and connection between the first shell 3_42 and the bottomcover plate 3_2; on the other hand, the resulting space formed by thefirst shell 3_42 and the bottom cover plate 3_2 provides a space for therefrigerant circulation. The pressure loss and the distributionperformance after the refrigerant passing through the refrigerantdistribution device 3 can be effectively controlled by adjusting theheight and the width of the first supporting feet 3_43. The firstsupporting feet 3_43 can utilize the connecting manner (for example,welding) known for those skilled in the art to connect the first shell3_42 with the bottom cover plate 3_2.

FIG. 18 is a structural schematic diagram of the fourth embodiment ofthe refrigerant distribution device in accordance with the presentinvention. As shown in FIG. 18, in this embodiment, the refrigerantdistribution device 4, along the refrigerant flowing direction,successively comprises: a refrigerant entering duct 4_1, a bottom coverplate 4_2, a core 4_3, a cylinder 4_4, an upper cover plate 4_5 andmulti-branch ducts 4_6. The refrigerant is throttled via the thermalexpansion valve 11, forms two phases state of gas and liquid, enters thedistribution device 4 via the entering duct 4_1 of the refrigerationdistribution device 4; the refrigerant of the two phases of gas andliquid is uniformly mixed in the distribution device 4 after impactingwith the core 4_3 of the distribution device 4 and being throttled, andflows into the heat exchanger 5 via the multi-branch ducts 4_6. Thestructural selection of core 4_3 is shown in FIG. 19 and FIG. 20, asdescribed in detail as follows.

FIG. 19 is a structural schematic diagram of the first embodiment ofcore of the refrigerant distribution device in FIG. 18. As shown in FIG.19, the core 4_31 is the semi-ellipsoidal second shell 4_316 with oneend open; the circular first openings 4_311 and the square thirdopenings 4_312 are uniformly distributed on the second shell 4_316; aplurality of guiding blades 4_313 are uniformly distributed at the innerside of the second shell 4_316. The second shell 4_316 is connected withthe bottom cover plate 4_2 by a plurality of second supporting feet4_314 disposed at the opening end of the shell. The big droplet liquidincluded in the refrigerant is broken into small droplets after therefrigerant entering through the entering duct 4_1 of distributiondevice 4 impacts the top of the second shell 4_316; the gas and liquidsimultaneously change the direction; partial refrigerant enters into themulti-branch ducts 4_6 of refrigerant distribution device 4 by the thirdopenings 4_312 and the first openings 4_311 on the second shell 4_316,and is distributed in heat exchanger 5. Partial refrigerant isdistributed in heat exchanger 5 after entering into the multi-branchducts 4_6 of refrigerant distribution device 4 by the gap formed betweenthe bottom cover plate 4_2, the second supporting feet 4_314 and thesecond shell 4_316. The pressure loss and the distribution performanceafter the refrigerant passing through the refrigerant distributiondevice 4 can be effectively controlled by adjusting the height and thewidth of the second supporting feet 4_314. The utility of guiding blades4_313 can make the refrigerant be distributed more uniformly in themulti-branch ducts 4-6, to improve the uniformity that the refrigerantis distributed to heat exchanger 5. Certainly, the second shell 4_316 isnot limited to semi-ellipsoid, other spherical surfaces are alsofeasible.

FIG. 20 is a structural schematic diagram of the second embodiment ofthe core of the refrigerant distribution device in FIG. 18. As shown inFIG. 20, in the embodiment, the core 4_32 comprises the cylindricalthird shell 4_321 and the semi-ellipsoidal fourth shell 4_322. The firstopenings 4_327 are distributed on the third shell 4_321 in a uniform andstaggered manner; a plurality of gaps 4_323, along the circumferencedirection, are uniformly provided at the open end. The circular fourthopenings 4_235 and the ellipsoidal fifth openings 4_326 are uniformlydistributed on the fourth shell 4_322. A plurality of guiding blades4_324 are uniformly distributed at the inner side of the fourth shell4_322. The big droplet liquid included in the refrigerant is broken intosmall droplets after the refrigerant entering by the entering duct 4_1of distribution device 4 impacts the top of the semi-ellipsoidal fourthshell 4_322; the gas and liquid simultaneously change the direction;partial refrigerant enters into the multi-branch ducts 4_6 ofrefrigerant distribution device 4 by the fourth openings 4_235 and thefifth openings 4_326 on the semi-ellipsoidal fourth shell 4_322, and isdistributed in heat exchanger 5. Partial refrigerant enters into themulti-branch ducts 4_6 of distribution device 4 by the first openings4_327 and the gaps 4_323 on the cylindrical shell 4_321, and isdistributed in heat exchanger 5. The pressure loss and the distributionperformance after the refrigerant passing through the refrigerantdistribution device 4 can be effectively controlled by adjusting theheight and the width of the gaps 4_323. The utility of guiding blades4_324 can make the refrigerant to more uniformly be distributed in themulti-branch ducts 4_6 to improve the uniformity that the refrigerant isdistributed in heat exchanger 5.

In these embodiments above, for said first openings to said thirdopenings, the present invention does not limit their size of theapertures, numbers and shapes. In actual operation, those skilled in theart can make a setting in accordance with the shape of the core;furthermore, said central line of the entering duct along the axisdirection, the symmetric center of said bottom cover plate, thesymmetric center of said core, said central line of the cylinder alongthe axis direction and the symmetric center of said upper cover plateare in one line.

It is noted that such relative terms as “first”, “second”, “third” asmentioned in this text are only used to differentiate one entity fromanother, not necessarily require or imply that any such actual relationor order exists among these entities. In addition, “include”, “comprise”or any other variants as mentioned in this text imply to contain nonexcludability inclusion.

The invention has been described by the embodiments as mentioned above,but it should be understood that said embodiments are only used forexemplification and description, not implied to limit the presentinvention in the scope of said embodiments; moreover, it can beunderstood by those skilled in the art that the invention is not limitedto said embodiments, more variants and modifications can be madeaccording to the invention, which fall in the scope that the inventionseeks to protect. The protection scope of the invention is limited byattached claims and their equivalent scope.

1. A refrigerant distribution device for a refrigeration system,characterized in that said refrigerant distribution device comprising:an entering duct a bottom cover plate, a core, a hollow cylinder, anupper cover plate and multi-branch ducts, said core disposed in thespace formed by said bottom cover plate, said cylinder and said uppercover plate, wherein a plurality of openings are distributed on saidcore.
 2. The refrigerant distribution device of claim 1, characterizedin that said upper cover plate having a centrosymmetric shape, and onthe center of the upper cover plate disposed an upper cover plateprotuberance protuberating toward said multi-branch ducts.
 3. Therefrigerant distribution device of claim 2, characterized in that saidupper cover plate having a circular or semi-ellipsoidal shape.
 4. Therefrigerant distribution device of claim 1, characterized in that saidupper cover plate and said cylinder are integrated.
 5. The refrigerantdistribution device of claim 1, characterized in that the side that saidentering duct connects said bottom cover plate having an invaginatedport, whose cross section contour being any of hyperbola, parabola orstraight line.
 6. The refrigerant distribution device of claim 1,characterized in that the inner wall of said entering duct provided withthreads.
 7. The refrigerant distribution device of claim 1,characterized in that said core being a circular flat plate withcentrosymmetric shape, a spherical crown protuberating to the cylinderprovided at its center, said openings uniformly distributed around thespherical crown, equal scale gaps uniformly distributed atcircumferential equal-angle of said core.
 8. The refrigerantdistribution device of claim 1, characterized in that said openingsbeing one or more of these kinds: circular openings, petal-shapedopenings and/or square openings.
 9. The refrigerant distribution deviceof claim 1, characterized in that said core being a hollow cone-shapedcylinder, said cylinder connected to said bottom cover plate bysupporting feet that disposed at the bottom of the cone, a narrow space(A) formed between said supporting feet.
 10. The refrigerantdistribution device of claim 1, characterized in that along therefrigerant's flowing direction, said core successively comprising acylindrical first cylinder with a larger section diameter, a connectorand a cylindrical second cylinder with a smaller section diameter, saidopenings uniformly distributed on said first cylinder, said connectorand said second cylinder.
 11. The refrigerant distribution device ofclaim 10, characterized in that said connector being annular flat plateor cone-shaped cylinder.
 12. The refrigerant distribution device ofclaim 1, characterized in that said core comprising a cylindricalcylinder, an ellipsoidal shell and an annular flat plate, said openingsuniformly distributed on said cylindrical cylinder, said shell embeddedwithin said cylindrical cylinder, said annular flat plate disposed inthe middle of said cylindrical cylinder and surrounding said cylindricalcylinder, a plurality of gaps uniformly provided at the peripheral edgeof said annular flat plate, supporting feet used to connect to saidbottom cover plate provided at said shell.
 13. The refrigerantdistribution device of claim 1, characterized in that said core being aspherical surface shell, said openings uniformly distributed on saidshell, supporting feet used to connect to said bottom cover plateprovided at the bottom of said shell.
 14. The refrigerant distributiondevice of claim 13, characterized in that a plurality of guiding bladesuniformly distributed at the inner side of said shell.